More speed cameras is 'just revenue raising': QPU

The Queensland Police Union (QPU) says increasing the number of speed cameras being deployed across the state is simply an exercise in revenue raising.

QPU president Ian Leavers says it will not lead to a reduction in the state's road toll.

It is the first time the QPU has publicly made such a suggestion.

The State Government plans to roll out digital speed cameras as part of a road safety campaign, but Mr Leavers says increasing police patrols would be a more effective measure.

"Speed cameras won't catch drink drivers, they won't catch unroadworthy vehicles, unlicensed vehicles, unregistered vehicles or those who are driving, talking on their mobile phones and all those other offences and dangerous driving," he said.

"They won't catch that - they will just catch those who are speeding."

A spokeswoman for Police Minister Neil Roberts says two digital speed cameras are being trialled in Ashgrove and Calamvale in Brisbane this year, but the number of devices across Queensland will not change.

"Wherever we've seen a reduction in the road toll, it's a combination of two things - good information to people through campaigns about the consequences of dangerous driving on our roads, and strong law enforcement, whether it's speed cameras or random breath testing," she said.

"There's a really easy way to avoid paying any revenue to the State Government for speeding and that's to stay within the speed limit."